Research on Multi-platform Time Difference of Arrival and Frequency Difference of Arrival Joint Location Technology

The current multi-station passive location system is divided into various types according to the measurement information used, time difference of arrival location technology, frequency difference of arrival location technology and cross-location technology, some joint location technologies based on the above information. Multi-station FDOA location requires knowing the frequency at which the radiation source signal reaches each base station. The measurement error is large, and it is only suitable for low-orbit satellites. It is easy to produce location ambiguity. The FDOA location method and other location methods can produce a good location effect. TDOA is a location system that is widely used at present. This system uses the time difference between pulse signals arriving at multiple base stations to form a time observation equation to solve the target radiation source position. The method has simple location technology and wide detection area, and can realize the instantaneous location of the target radiation source. For moving radiation sources, the TDOA and FDOA joint location technology, the information received by the reconnaissance station includes time information and frequency information, and the use of observation information in multiple dimensions can more accurately estimate the target position.